ROLLING MILL INDUSTRY OF
INDIA
DEFINITION OF
ROLLING MILL
Rolling Mill Process
IN METALWORKING, ROLLING IS A METAL FORMING PROCESS IN WHICH METAL
STOCK IS PASSED THROUGH ONE OR MORE PAIRS OF ROLLS TO REDUCE THE
THICKNESS AND TO MAKE THE THICKNESS UNIFORM. THE CONCEPT IS SIMILAR
TO THE ROLLING OF DOUGH. ROLLING IS CLASSIFIED ACCORDING TO THE
TEMPERATURE OF THE METAL ROLLED. ITS HAVE TWO ROLLED
ROLLING MACHINE PARTS
1. Rolling Gear
2. Rolling Stand
3. Roller
4. IGNOT
5. Stetting Screw
Hot Rolled Cold Rolled
TYPE OF ROLLED
A. HOT ROLLED :-
Hot rolled steel is steel that has been roll-pressed at very high temperatures—over
1,700˚F, which is above the re-crystallization temperature for most steels. This
makes the steel easier to form, and resulting in products that are easier to work
with.
ADVANTAGES & DISADVANTAGES
Advantages
– Easier to make: heat it up, push through, cool down and that’s it!
– Cheaper than cold rolled
– Hot rolled steel is allowed to cool at room temperature and it’s free from internal stresses that
can arise from quenching or work-hardening processes
– Most popular shapes are hot-rolled (UC, UB, SHS, RHS, PFC, flats etc.)
Disadvantages
– dimensional imperfections caused by heating (expanding) and cooling down (shrink, warpage)
– rough texture on a surface, need to be removed and buffed before painting
– Slight distortions
B. COLD ROLLED :-
Cold rolled steel is essentially hot rolled steel that has been through further
processing. Once hot rolled steel has cooled, it is then re-rolled at room
temperature to achieve more exact dimensions and better surface qualities.
ADVANTAGES & DISADVANTAGES
Advantages
– accurate shape (consistent and straight)
– a wider range of surface finishes
– a smooth and shinier surface
– bars are true and square and have well-defined edges and corners
– Tubes have better concentric uniformity and straightness.
Disadvantages
– more expensive
– fewer shapes available cold-rolled (sheets, box section shapes: CHS, SHS,
RHS)
– additional treatments can create internal stress within the material; this can
cause unpredictable warping if the steel is not stress relieved prior to cutting,
grinding, or welding.
TYPE OF
ROLLING MILL
1. Two-High Rolling Mills
2. Three-High Rolling Mills
3. Four High Rolling Mill
4. Cluster Mill
5. Multi-High Rolling Mill
6. Universal Rolling Mill
USES -
metal furniture,
desks, filing cabinets
tables, chairs,
motorcycle exhaust pipes,
computer cabinets and hardware,
home appliances and components,
steel drums,
water heaters,
metal containers,
fan blades,
frying pans
wall and ceiling mount kits,
TOP LISTED COMPANY'S
1)Kalyani Steel Ltd.
Pune – Maharashtra
2) SUNFLAG IRON & STEEL CO. LTD.
Nagpur – Mahapatra
3)Ismt Ltd
Nagpur – Maharashtra
4)Minakshi Ltd
Silvasha – Gujarat
Guwahati – Assam
Hyderabad – AANDHRA Pradesh
Bhopal – Madhya Pradesh
Anjar – Kutch
5)Ludhiana Steel Rolling Mill
Ludhiana – Panjab
ROLLING MILL MACHINES
Double Head Rolling Mill Premium Quality with Emergency Break
Hydraulic Shaft less Mill Roll Stand Machine
Three Roll Mill Machine
Semi-Automatic Rolling Mill Fly Wheels
Two Roll Mill Machine
Etc ……
CURRENT ISSUES
1. Capital
2. Lack of Technology
3. Low Productivity
4. Inefficiency of public sector units
5. Low potential utilisation
6. Heavy demand
7. Shortage of metallurgical coal
8. Inferior quality of products
FUTURE OF ROLLING MILL INDUSTRIES
Its Truly Depended On Iron, Metal, Stell, etc.
Which Difficulty's Are Facing THIS INDUSTRIES Are Having Changes In Rolling Mill Industry , Like If
Steel Price Are Increasing and if price was going low then its also have changes in rolling industries.
So if This Industries Have A Bright Feature Then Its Have No dout That Rolling Mill Is Have A good Future.
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